User manual

98.05.08.09.00

Color LaserWriter 12/600 PS Troubleshooting 2–10

Roller Diameters

General

Horizontal print defects that occur repetitively over a single page are

almost always caused by dirty or damaged rollers. By measuring the

tracks on the page and noting the side of the page that the tracks are on,

you can isolate horizontal defects to a speciﬁc roller within the printer.

The following chart shows the major rollers within the printer and the

kinds of defects caused by them.

Lower Fuser Roller

Upper Fuser Roller

Photosensitive Drum

Developing Cylinder

Primary Charging Roller

Attraction Roller

Discharge Roller

Cleaning Brush

5.27" (134 mm)

5.07" (129 mm)

1.96" (50 mm)

1.49" (38 mm)

1.96" (50 mm)

3.70" (94 mm)

Repetitive tracking on back of page

Repetitive tracking on front of page

Roller Interval on Page Possible Defects

Repetitive tracking on front of page

Repetitive blank spots or tracking on front of page

Repetitive tracking on front or back of page

Repetitive tracking on back of page

Note: Faint tracking of calibration patches on the

back of the page indicates a problem with the

cleaning brush.